SkyTrak 6042 Service Manual - Manual (Page 101)

3.55 Model 6042 Legacy Origin 7/02
Boom
3.4.4 Boom Chain Tension Adjustment
Note: Always perform Section 3.4.3, Boom Chain Ten-
sion Check before adjusting the boom chain tension.
Figure 3-116 Boom Extend Chains and Yoke Plates
1. Adjust the two boom extend chains (Fig. 3-116, 1).
If the chain sag measurement (Fig. 3 -117, 3) is less
than 1-1/2" (38 mm), tighten the two extend chain
adjustment locknuts (Fig. 3-118, 1).
If the chain sag measurement (Fig. 3-117, 3) is more
than 2-1/2" (64 mm), loosen the two extend chain
adjustment locknuts (Fig. 3-118, 1).
Figure 3-117 Extend Chain Sag
2. Tighten or loosen the two extend chain adjustment
locknuts (Fig. 3-118, 1) located at the rear of the
boom. Be sure each of the locknuts are adjusted
equally so that each extend chain maintains the
same tension.
Equal chain tension can be checked by the position
of the yoke (Fig. 3-116, 2) on the outer boom. The
front of the yoke (2) should be parallel with the front
edge of the outer boom.
Figure 3-118 Extend Chain Adjustment Locknuts
3. If there is no adjustment left on the extend chains,
tighten the retract chain locknut (Fig. 3-119, 1) at the
front on the underside of the outer boom.
Figure 3-119 Retract Chain Locknut
OH0240
1
2
OA0492
1
2
3
MH1751
1
OA0512
1